S201

©

WARNING

Fisher regulators must be installed, operated,and maintained in accordance with federal,state, and local codes, rules and regulations, andFisher instructions. For LP-gas service, anapproved regulator (such as one listed by U.L.)should be used. The installation, in most states,must comply with NFPA standards.

If the regulator vents gas or a leak develops in thesystem, service to the unit may be required.Failure to correct trouble could result in ahazardous condition.

Call a gas serviceman to service the unit. Only aqualified person must install or service theregulator.

by Fisher Controls 1981

Figure 1. Typical S200 Series Gas Regulator

W1919

Scope of Manual

This instruction manual provides instructions and a partslist for Types S201, S201H, S201K, S202, and S202H gasservice regulators.

INTRODUCTION

Description

Type S201 and S202 series regulators are typically installedon industrial and commercial applications. The S202 andS202H units contain an internal relief valve. Units with an“H” or “K” suffix are similar to the basic regulators butdeliver a higher outlet pressure (1 to 10 psig).

Par

t N

o D

4000

07X

012

Specifications

Table 1 lists the specifications for the regulators. Thefollowing information is stamped on the regulator at thefactory: type number, date of manufacture, spring range,port size, maximum inlet pressure, maximum operatingoutlet pressure, and outlet pressure which may damageregulator parts.

INSTALLATION

WARNING

Personal injury or system damage may result ifthis regulator is installed, without appropriateoverpressure protection, where service condi-tions could exceed the limits given on theregulator nameplate. Regulator installationsshould be adequately protected from physicaldamage.

All vents should be kept open to permit freeflow of gas to the atmosphere. Protect openingsagainst entrance of rain, snow, insects, or anyother foreign material that may plug the vent orvent line. On outdoor installations, point thespring case vent downward to allow condensateto drain (see figure 2). This minimizes thepossibility of freezing and of water or otherforeign materials entering the vent and interferingwith proper operation.

Fisher Controls Instruction Manual

Type S201 & S202Gas Regulators

September 1981 Form 5171

Type S201 and S202

Type S201 and S202

Under enclosed conditions or indoors, escapinggas may accumulate and be an explosion hazard.In these cases, the vent should be piped awayfrom the regulator to the outdoors.

Like most regulators, S201 and S202 regulatorshave an outlet pressure rating lower than theirinlet pressure rating. If actual inlet pressure canexceed the outlet pressure rating, outlet over-pressure protection is necessary. However, over-pressuring any portion of the regulators beyondthe limits in table 2 may cause leakage, damageto regulator parts, or personal injury due tobursting of pressure-containing parts.

Some type of external overpressure protectionshould be provided if inlet pressure will be highenough to damage downstream equipment.Common methods of external overpressure pro-tection include relief valves, monitoring regu-lators, shutoff devices, and series regulation.

If the regulator is exposed to an overpressurecondition, it should be inspected for anydamage that may have occurred. Regulatoroperation below these limits does not precludethe possibility of damage from external sourcesor from debris in the pipeline.

Before installing the regulator, check for damage whichmight have occurred in shipment. Also check for dirt orforeign matter which may have accumulated in the regulatorbody or in the pipeline. Apply pipe compound to the malethreads of the pipeline and install the regulator so that flowis in the direction of the arrow cast on the body. Thediaphragm casing assembly can be rotated to any positionrelative to the body. Loosen the two cap screws (key 18,figure 4) in order to rotate the diaphragm casing assembly.

Do not install the regulator in a location where there can beexcessive water accumulation, such as directly beneath adown spout.

If the regulator is used in conjunction with a 289H reliefvalve, it should be installed as shown in figure 2. The out-

CAUTION

2

side end of the vent line should be protected with a rain-proof assembly.

The Type 289H should be set 10 inches W.C. higher than theoutlet pressure setting of the regulator, up to 30 inches W.C.reduced pressure. For pressure greater than this, setthe 289H 3/4 psi higher than the outlet pressure setting of theregulator.

The Type S201 and S202 regulators have 1-inch NPTscreened vent openings in the spring case. If necessary tovent escaping gas away from the regulator, install a remotevent line in the spring case tapping. Vent piping should beas short and direct as possible with a minimum number ofbends and elbows. The remote vent line should have thelargest practical diameter. Vent piping on regulators withinternal relief (S202 & S202H) must be large enough tovent all relief valve discharge to atmosphere without ex-cessive back pressure and resulting excessive pressure inthe regulator.

Periodically check all vent openings to be sure that they arenot plugged.

pS.1elbaT

DNASEZISYDOBNOITCENNOCDNE

ELYTS

dewercsTPNhcni2ro2/1-1teltuodnatelni n ssalchcni2

degnalfISNA521

MUMIXAMTELNIELBAWOLLA

SERUSSERP

2elbateeS

MUMIXAMTELTUOYCNEGREME

ERUSSERP

)rab30.1(gisp51

ERUSSERPTELTUOEGNAR

gisp01ot.C.W"0.2rab96.0otrabillim9.4(

snoitacifce

SRETEMAIDGNIRTAES dna,1,2/1,8/3,4/1sehcni61/3-1

ERUTAREPMETSEITILIBAPAC

ot°92-(°051+ot°02-)C°66

ERUSSERPNOITARTSIGER

lanretnI

THGIEWETAMIXORPPA )gk01(sdnuop22

Figure 2. Type S201 Regulator Installed with the VentPointed Downward and with an H289 Relief

Valve for High Capacity Relief

AJ4698A1121

Type S201 and S202

erusserPtelnI.2elbaTeziSgniRtaeS gnitteSerusserPtelnI

sehcnI mmmumitpO mumixaM

gisP raB gisP raB

4/1 3.6 521 6.8 521 6.8

8/3 5.9 001 9.6 521 6.8

2/1 7.21 06 1.4 001 9.6

4/3 0.91 52 7.1 06 1.4

1 4.52 31 9. 52 7.1

61/3-1 2.03 5 3. 31 9.

gnitteSerusserPteltuOmumixaM.3elbaTepyT

rebmuNmgarhpaiD

daeH*teltuOmumixaM

202S,102S thgiL )rabillim7.47(.C.W"03H202S,H102S yvaeH )rab43.0(gisp5

K102S yvaeH )rab96.0(gisp01

roferusserp)gnisac(teltuoycnegrememumixaM*.gisp51si002SseireS

Maximum outlet pressure settings are shown in table 3.Outlet pressure more than 2 psi (light diaphragm head) or3 psi (heavy diaphragm head) above the set point maydamage internal parts such as the diaphragm head andvalve disk. The maximum emergency (casing) outlet pressureis 15 psig.

trahCgnirpS.4elbaT

epyTrebmuN

egnaRgnirpSrebmuNtraP edoCroloC

.C.WsehcnI rabilliM

,102S202S

5.4-0.25.6-5.30.9-0.50.81-5.80.03-0.41

2.11-9.42.61-7.84.22-4.218.44-2.127.47-9.43

220725298D1220726298D1210727298D1230722398D1230723398D1

nworBdeRkcalByarG

neerGkraD

,H102SH202S

gisp0.2-0.1gisp52.3-5.1

gisp0.5-0.2

rab41.-70.rab22.-01.rab43.-41.

230728579H1230729579H1241724516P1

eulBkraDegnarO

wolleY

K102Sgisp5.5-0.2gisp0.01-0.4

rab83.-41.rab96.-82.

220724660YO230724208H1

epirtSneerGmuimdaC

Pressure gauges should always be used tomonitor downstream pressure during startup.Procedures used in putting this regulator intooperation must be planned accordingly if thedownstream system is pressurized by anotherregulator or by a manual bypass.

If the downstream system is not pressurized by anotherregulator or manual bypass valve, use the following pro-cedure to start-up the regulator.

1. Check to see that all applicances are turned off.

2. Slowly open the upstream plug cock.

3. Check all connections for leaks.

CAUTION

STARTUP

4. Light the appliance pilots.

Adjustment

The range of allowable pressure settings is stamped on thenameplate. If the required setting is not within this range,substitute the correct spring (as shown in table 4). If thespring is changed, be sure to change the nameplate toindicate the new pressure range.

A pressure gauge should always be used to monitordownstream pressure while adjustments are being made.

1. Remove the closing cap (key 4, figure 4) or loosen thehex locknut.

2. To increase the outlet setting, turn the adjusting screw(key 3, figure 4) clockwise. To decrease the outlet setting,turn the adjusting screw counterclockwise.

3. Replace the closing cap or tighten the hexlocknut.

Installation arrangements may vary, but in anyinstallation it is important that the valves be openedor closed slowly and that the outlet pressure bevented before venting inlet pressure to preventdamage caused by reverse pressurization of theregulator. The steps below apply to the typicalinstallation as indicated.

1. Open valves downstream of the regulator.

2. Slowly close the upstream shutoff valve.

3. Inlet pressure will automatically be released down-stream as the regulator opens in response to the loweredpressure on the diaphragm.

SHUTDOWN

Refer to figure 3. When downstream demand decreases, thepressure under the diaphragm increases. This pressureovercomes the regulator setting (which is set by a spring).Through the action of the pusher post assembly, the valvedisk moves closer to the seat ring and reduces gas flow. Ifdemand downstream increases, pressure under the diaphragmdecreases. Spring force pushes the pusher post assemblydownward, the valve disk moves away from the seat ring,and the gas flow increases.

The Type S202 and S202H regulators include an internalrelief valve for over pressure protection. If the downstreampressure exceeds the regulator setting by 7 inches W.C. to2 psig (depending on the main spring used), the relief valveopens and excess gas is vented through the stabilizer ventin the upper spring case.

PRINCIPLE OF OPERATION

3

Type S201 and S202

A42

Figure 3. Type S202 Regulator Operational Schematic

12

To avoid personal injury or equipment damage,do not attempt any maintenance or disassemblywithout first isolating the regulator from systempressure and relieving all internal pressure as de-scribed in “Shutdown”.

Regulators that have been disassembled forrepair must be tested for proper operationbefore being returned to service. Only partsmanufactured by Fisher should be used forrepairing Fisher regulators. Relight pilot lightsaccording to normal startup procedures.

Due to normal wear or damage that may occurfrom external sources, this regulator should beinspected and maintained periodically. Thefrequency of inspection and replacement ofparts depends upon the severity of serviceconditions or the requirements of local, state,and federal rules and regulations.

MAINTENANCE

WARNING

Disassembly to Replace Diaphragm

1. Remove the closing cap (key 4, figure 4) or loosen hexlocknut. Turn the adjusting screw or nut (key 3) counter-clockwise to ease spring compression.

2. On S201, S201H, S202, and S202H units, remove theadjusting screw and spring (key 2).

From Type S201K remove the adjusting screw, hex locknut,the closing cap (key 4), the upper spring seat (key 6), andspring (key 2).

3. Remove hex nuts (key 15) and cap screws (key 14).

Separate the upper spring case (key 1) from the lower casingassembly (key 9).

Note

If disassembling a Type S202 or S202H regu-lator, lift the upper spring case straight up inorder to avoid hitting the stem (key 24).

4. Slide the diaphragm and diaphragm head assembly(key 7) away from the body (key 21) to unhook the pusherpost (key 8) from the lever (key 10). Lift off the diaphragmand diaphragm head assembly.

5. Unscrew the cap screw or stem (key 24) which fastensthe lower spring seat (key 6) to the pusher post and separatethe lower spring seat, diaphragm and diaphragm headassembly, and pusher post. (The relief valve spring, key 25,will also have to be removed from Type S202 and S202Hregulators.)

6. Reassemble the spring case unit in the reverse order ofthe above steps. Before tightening the cap screw or steminto the pusher post, place the loosely-assembled diaphragmassembly into position in the lower casing, being sure thatthe pusher post is hooked on the lever. Rotate the dia-phragm so that the diaphragm and lower casing holes arealigned. Tighten the screw or stem.

Before tightening cap screws (key 14), replacethe spring and adjusting screw. Turn the ad-justing screw to about mid position. This willstretch the oversized diaphragm to ensure slackin the assembled diaphragm. The slack createdby this method is necessary for good regulation.Be sure the diaphragm does not fold over at theflange when reassembling.

CAUTION

Disassembly to Replace Valve Diskand Seat Ring

1. Remove the bolts (key 18, figure 4) which hold thelower spring casing (key 9) to the body (key 21). Separatethe lower spring casing from the body.

2. Check the body O-ring (key 19) for wear.

3. Examine the valve disk (key 16) for nicks, cuts, andother damage. Unscrew the disk holder assembly from thevalve stem assembly (key 13) and replace it with a new partif necessary.

4. If the seating edge of the seat ring (key 20) is nicked orrough, remove the seat ring from the body. Change to a newpart when reassembling the regulator. (If the seat ringis being replaced with a different sized port, change thenameplate to state the new size and maximum inletpressure.)

5. Reassemble the regulator in reverse order of the abovesteps.

4

Type S201 and S202

The type number, seat ring size, spring range, and date ofmanufacture are stamped on the nameplate. Alwaysprovide this information in any correspondence with your

ORDERING PARTS

Fisher representative regarding replacement parts or tech-nical assistance. If construction changes are made in thefield, be sure that the nameplate is also changed to reflectthe most recent construction.

Figure 4. Type S202 Regulator

5

Type S201 and S202

Key Description Part Number

1 Spring CaseAluminum 4L1423 08032Pinned for heavyspring 1J7186 99002

2 Spring, steel, see table 43 Adjusting Screw

Aluminum (S201, S201H,S202, S202H) 1L9286 08012

Steel (S201K) 1P8085 T00124 Closing Cap


Brass (S201K) 1H7987 140125* Closing Cap Gasket

Neoprene 1N4462 069926 Upper/Lower Spring Seat


Brass S201K)(2 req’d) 1H7974 14012

7A* Diaphragm, nitrileS201, S202 - Use with1D8933 & lightersprings 1H9781 02072

S201H, S202H 1L1543 02052S201K 1K6496 02052

7B* Diaphragm Head, steelS201, S202 - Use with1D8933 & lightersprings 1H9779 28892

S201H, S202H 1H9780 25032S201K 1A3478 25022

8 Pusher Post, aluminumS201, S201H, S201K 2H9806 08012S202, S202H 2H9752 08012

PARTS LIST

While this information is presented in good faith and believFisher Constrols does not guarantee satisfactory results frinformation. Nothing contained herein is to be construed asguarantee, express or implied, regarding the performance,

Fisher Controls

Printed in USA


9 Lower Casing AssemblyAluminum 1H9751 X0012

9B Union Ring, aluminum(2 req’d) 2H9734 08022

10 Lever, steel 1H9740 2899211 Pin, 303 SST 1H9729 3503212 Machine Screw, steel

(2 req’d) 1B4204 2898213 Valve Stem Assembly 1H9748 000A214 Cap Screw, steel

(12 req’d) 1B1363 2405215 Hex Nut, steel, Cd pl

(12 req’d) 1A3093 2412216* Disk Holder Assembly

For Natural GasService 1P7349 000A2

For Manufactured Gas(3/4" largerseat rings) 1J1680 X0012

17 Diaphragm PlateSteel (S201K only) 1A3478 25022

18 Cap Screw, steel, Cd pl(2 req’d) 1H9747 24052

19* O-Ring, nitrile T12587 T0012

20 Seat Ring, aluminum1/4" Port Diameter 1H9792 090223/8" Port Diameter 1H9793 090221/2" Port Diameter 1H9794 090223/4" Port Diameter 1H9795 090221" Port Diameter 1H9796 090221-3/16" PortDiameter 1H9797 09022

21 BodyCast Iron1-1/2" NPT 1J1903 190122" NPT 1H9749190122" 125 lb. Flanged 2K1842 190122" 250 lb. Flanged 2K1845 19012

*Recommended spare part.

†Trademark of International Nickel Company

ed to be accurate,om reliance upon such a warranty or merchantability, fitness

or any other matter with resuse any product or process the right, without notice, to athe products described here

For information, contact FisMarshalltown, Iowa 50158 UCernay 68700 France


21 Body (Continued)With 1/8" NPT Test Gauge Connection1-1/2" NPT 1P7992 190122" NPT 1P7993 190122" 125 lb. Flanged 2P8061 190122" 250 lb. Flanged 2P8062 19012

Steel1-1/2" NPT 1K7879 220122" NPT 1K7921 22012

With 1/8" NPT Test Gauge Connection1-1/2" NPT 1P7991 220122" NPT 1P7994 22012

24 Cap Screw, steel, Zinc plS201 1H9754 24272S201H 1A6678 24052S201K 1K4278 28982

Stem, steel, Zinc plS202, S202H 1H9692 24272

25 Relief Valve Spring, steel, Cd pl(S202, S202H)Standard 1H9760 27012For U.L. listed unitswith 1D8933 orlighter springs 1R1004 27012

32 Nameplate, aluminum 11A5497 X01246 Pipe Plug, 1/8" NPT

Brass 1A6219 1401253 Hex Nut, steel, Cd pl

S201K only 1A3524 2411255 Flapper Stem

302 SST 1H9763 3502256 Lower Flapper

Nylon 1H9764 0699257 Upper Flapper, nylon 1H9765 0699258 Seat Ring, 302 SST 1H9766 3601259 Self-tapping Screw, steel

(3 req’d) 1H9767 2898260 Spring, 302 SST

(2 req’d) 1H9768 3702261 Screen, Monel† 1E5648 4312262 Snap Ring, 302 SST 1E5649 37022

pect to the products, nor as a recommendation toin conflict with any patent. Fisher Controls reserveslter or improve the designs or specifications ofin.

her Controls:SA Sao Paulo 05424 Brazil

Singapore 0512

Documents

S201